# IsI Calculator vs GradTime

The clearest difference is iOS requirement: IsI Calculator at 9.0 against GradTime's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | IsI Calculator | GradTime |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | — |
| Size | 15 MB | 89 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPad, iPod, Apple Watch | iPhone, iPad, Mac, Apple TV |
| Age rating | 4+ | 17+ |
| Developer | [Dominic Barra](https://appshunter.io/developer/891093115) | [GradMarket LLC](https://appshunter.io/developer/6798641599) |

## What reviewers say

### IsI Calculator

[App page](https://appshunter.io/ios/app/isi-calculator/id891516315)

**Features:** macOS Compatibility

**In-app purchases:** none


### GradTime

[App page](https://appshunter.io/ios/app/gradtime/id6819638855)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is IsI Calculator free?

IsI Calculator is free to download, with no in-app purchases.

### Is GradTime free?

GradTime is free to download, with no in-app purchases.

### Do IsI Calculator or GradTime have ads?

Neither IsI Calculator nor GradTime shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*